Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh hai » thanh hai, nhanh hai, hang hai
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
hai cuu » hai cua, hai chu, hai cuc
kham lo » pham lao
vu kham » vu khanh
hieu vu » hieu va, hieu ve, hieu su
cuu tre » cua tre, cau tren, cau treo
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, me hoi
lo van » le van, vo van, so van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuoc sach)) ty nang ((ma hoi) or (ma hoa)). hieu vu kham lo van hanh hai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ty nang ((ma hoi) OR (ma hoa)). hieu vu kham lo van hanh hai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ty nang ((ma hoi) or (ma hoa)). hieu vu kham lo van hanh hai cuu tre*.